A start on styling notebooks.

I'd like the website to have some consistency.

implementations/Python/joy.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-#    Copyright © 2022 Simon Forman
+#    Copyright © 2022 - 2023 Simon Forman
 #
 #    This file is part of Thun
 #
@@ -266,6 +266,7 @@ def reversed_stack(stack):
 ██╔══╝   ██╔██╗ ██╔═══╝ ██╔══██╗██╔══╝  ╚════██║╚════██║██║██║   ██║██║╚██╗██║
 ███████╗██╔╝ ██╗██║     ██║  ██║███████╗███████║███████║██║╚██████╔╝██║ ╚████║
 ╚══════╝╚═╝  ╚═╝╚═╝     ╚═╝  ╚═╝╚══════╝╚══════╝╚══════╝╚═╝ ╚═════╝ ╚═╝  ╚═══╝
+Expression
 
 As elegant as it is to model the expression as a stack, it's not very
 efficient, as concatenating definitions and other quoted programs to
@@ -300,6 +301,7 @@ def next_term(expression):
 ██╔═══╝ ██╔══██║██╔══██╗╚════██║██╔══╝  ██╔══██╗
 ██║     ██║  ██║██║  ██║███████║███████╗██║  ██║
 ╚═╝     ╚═╝  ╚═╝╚═╝  ╚═╝╚══════╝╚══════╝╚═╝  ╚═╝
+Parser
 
 There is a single function for converting text to joy expressions
 as well as a Symbol class and an Exception type.  The Symbol
@@ -389,6 +391,7 @@ def text_to_expression(text):
 ██╔═══╝ ██╔══██╗██║██║╚██╗██║   ██║   ██╔══╝  ██╔══██╗
 ██║     ██║  ██║██║██║ ╚████║   ██║   ███████╗██║  ██║
 ╚═╝     ╚═╝  ╚═╝╚═╝╚═╝  ╚═══╝   ╚═╝   ╚══════╝╚═╝  ╚═╝
+Printer
 '''
 
 
@@ -565,6 +568,7 @@ def interp(stack=(), dictionary=None):
 ██║  ██║██║██║        ██║   ██║██║   ██║██║╚██╗██║██╔══██║██╔══██╗  ╚██╔╝
 ██████╔╝██║╚██████╗   ██║   ██║╚██████╔╝██║ ╚████║██║  ██║██║  ██║   ██║
 ╚═════╝ ╚═╝ ╚═════╝   ╚═╝   ╚═╝ ╚═════╝ ╚═╝  ╚═══╝╚═╝  ╚═╝╚═╝  ╚═╝   ╚═╝
+Dictionary
 '''
 
 
@@ -643,6 +647,7 @@ def help_(stack, expression, dictionary):
 ██║     ██║   ██║██║╚██╔╝██║██╔══██╗██║██║╚██╗██║██╔══██║   ██║   ██║   ██║██╔══██╗╚════██║
 ╚██████╗╚██████╔╝██║ ╚═╝ ██║██████╔╝██║██║ ╚████║██║  ██║   ██║   ╚██████╔╝██║  ██║███████║
  ╚═════╝ ╚═════╝ ╚═╝     ╚═╝╚═════╝ ╚═╝╚═╝  ╚═══╝╚═╝  ╚═╝   ╚═╝    ╚═════╝ ╚═╝  ╚═╝╚══════╝
+Combinators
 '''
 
 
@@ -754,6 +759,7 @@ def quit(stack, expr, dictionary):
 ██║     ██║   ██║██╔══██╗██╔══╝      ██║███╗██║██║   ██║██╔══██╗██║  ██║╚════██║
 ╚██████╗╚██████╔╝██║  ██║███████╗    ╚███╔███╔╝╚██████╔╝██║  ██║██████╔╝███████║
  ╚═════╝ ╚═════╝ ╚═╝  ╚═╝╚══════╝     ╚══╝╚══╝  ╚═════╝ ╚═╝  ╚═╝╚═════╝ ╚══════╝
+Core Words
 '''
 
 
@@ -1076,6 +1082,7 @@ for alias, name in (
 ██║  ██║██╔══╝  ██╔══╝  ██║██║╚██╗██║██║   ██║   ██║██║   ██║██║╚██╗██║╚════██║
 ██████╔╝███████╗██║     ██║██║ ╚████║██║   ██║   ██║╚██████╔╝██║ ╚████║███████║
 ╚═════╝ ╚══════╝╚═╝     ╚═╝╚═╝  ╚═══╝╚═╝   ╚═╝   ╚═╝ ╚═════╝ ╚═╝  ╚═══╝╚══════╝
+Definitions
 '''
 
 
@@ -1133,6 +1140,9 @@ class Def(object):
    ██║     ╚██╔╝  ██╔═══╝ ██╔══╝      ██║     ██╔══██║██╔══╝  ██║     ██╔═██╗ ╚════██║
    ██║      ██║   ██║     ███████╗    ╚██████╗██║  ██║███████╗╚██████╗██║  ██╗███████║
    ╚═╝      ╚═╝   ╚═╝     ╚══════╝     ╚═════╝╚═╝  ╚═╝╚══════╝ ╚═════╝╚═╝  ╚═╝╚══════╝
+Type Checks
+
+Simple guard functions, for type inference see the Prolog versions.
 '''